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Rasmussen's encephalitis: proton MR spectroscopy and diffusion MR findings
1Department of Radiology, Ege University Hospital, Bornova, Izmir, Turkey.
Journal of Neuroradiology = Journal De Neuroradiologie
|December 6, 2000
Summary
Rasmussen's encephalitis imaging reveals higher apparent diffusion coefficient (ADC) values and altered metabolite ratios (NAA/Cho, Cho/Cr) in affected brain regions. These findings aid in understanding the neuroinflammatory process and guiding diagnosis.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Rasmussen's encephalitis is a rare, chronic inflammatory brain condition causing progressive neurological deficits.
- Previous studies utilized MR imaging and spectroscopy, but advanced diffusion-weighted imaging (DWI) and proton MR spectroscopy (1H-MRS) offer detailed insights.
Purpose of the Study:
- To investigate the utility of diffusion-weighted MR imaging and proton MR spectroscopy in characterizing Rasmussen's encephalitis.
- To identify specific imaging biomarkers for this neuroinflammatory condition.
Main Methods:
- Proton MR spectroscopy (1H-MRS) and diffusion-weighted MR imaging (DWI) were performed on three patients with Rasmussen's encephalitis.
- Apparent diffusion coefficient (ADC) values were measured in affected parenchyma and compared to healthy controls.
- 1H-MRS data (TR=1,500 msec, varying TEs) were analyzed for metabolite concentrations (NAA, Cho, Cr, mI, lactate) and compared to controls.
Main Results:
- Mean ADC values in affected parenchyma were significantly higher (1.74 x 10(-3) mm(2)/sec) compared to controls (0.88 x 10(-3) mm(2)/sec).
- 1H-MRS revealed decreased N-acetylaspartate (NAA), increased choline (Cho), decreased NAA/Cho and NAA/Cr ratios, and increased Cho/Cr ratios in affected areas.
- Slightly increased myo-inositol (mI) peaks and mI/NAA ratios were observed, with a prominent lactate peak in one patient.
Conclusions:
- DWI and 1H-MRS provide valuable quantitative biomarkers for Rasmussen's encephalitis.
- The observed changes in ADC values and metabolite profiles reflect the underlying neuroinflammation and neuronal damage characteristic of the condition.